Portable crosscut-saw.



PATRNTRD APR. 19, 1904.

P. RICHTER. I PORTABLE GROSSGUT SAW.

APPLICATION FILED JULY 14, 1903.

N0 MODEL.

UNTTED STATES Patented April 19, 1904.

PATENT OFFICE.

PORTABLE GROSSCUT-SAW- SPECIFICATIONforming part of Letters Patent No. 7 57,770, dated April 19, 1904. Application filed July 14, 1903. Serial No. 165,463. (No model.)

To all ww'nt t 71mg/ concern,.-

Be it known that I, FELIX RICHTER, a subject of the Emperor of Germany, and a resident of Borsdorf, near LeipZig,Germany, have invented certain -new and useful Improvements in Portable OroSscut-Saws, of which the following is a specification.

My invention relates to improvements in portable crosscut-saws.

Hy new sawing apparatus differs from prior saws of similar construction inasmuch as I employ an electric motor the base of which is provided with handles in the manner of a stretcher and carries clamping mechanism by means of which the apparatus can be secured upon the timber to be out and a saw worked by the motor. In prior portable crosscutsaws, on the other hand, the clamping mechanism is employed in conjunction with a bandsaw. My new saw, therefore, is driven by an electric motor and can readily be transported from place to place, while being extremely efficient in its working. p

My invention is illustrated in the accompanying drawings, in which- Figure l is an elevation, and Fig. 2 a plan, of the saw. Fig. 3 is a sectional View showing the clamp mechanism drawn to a larger scale.

On the framing a, constructed with handles in the manner of a stretcher, is mounted an electric motor L and a saw c, driven by the former. The main framing a is also provided with a clamping device, whereby the Whole apparatus when set over the timber s t0 be cut can be secured to the latter.

In the construction of apparatus shown the clamping mechanism consists of two pairs 0f toothed jaws t' a', of which only onepair can be seen on the drawings. One of the arms of each pair of jaws must be pivotally suspended, and in order that the apparatus may be employed for timber of different girths at least one of the jaw-arms must also be capable of sliding on the framing. This may be done, for example, by pivoting such arm to a slide If the slide is arranged to travel in wellknown manner on one of the bars Z of the frame a and a rack m and pawl n, with leverhandle o, provided to'enable adjustment and fixing in any position, it is clear that the clamp can be used for timber of very various girths. The jaw e', which is pivoted to the slide L, is held in position by any suitable stop mechanism. It is forced against the timbers, together with the slide 7c, and in conjunction with the coperating rigid arm t' embraces the timber. For the purpose of assisting the jamming action a toggle p is pivoted to the slide c and provided with a handle 7, the other end being pivoted to the sliding arm z'. By bringing the toggle into the extended position by means of thel handle r it is obvious that the arm c' will be lirrnly forced against the timber.

In the apparatus shown in the drawings the shaft Z of the electric motor is provided with a worm e and the power is transmitted to the driving-shaft f by means of a worm-wheel. The crank g is keyed to the shaft f and engages in a slot in the oscillating lever L, the farther end of which is likewise slotted. In the latter slot there engages a pin on the saw, which can thus be reciprocated in guideways secured to the bow u. The latter, with the guideways t, also serves to weight the saw, and the pressure can still further be increased by the Sawyer pressing' with the hand on the guide t.

The design of the frame is such as to permit it to be readily carried from tree to tree by two men. Since the weight of an electric motor for driving ,such a saw is relatively very small, it is obvious that the apparatus may be used not only on horizontal but also on timber lying in an inclined position or even standing erect. With this apparatus, therefore, trees may be sawed or partly sawed through, so that the work of felling is greatly facilitated. The jaws z' also serve as'feet.

What I claim is- 1. In a portable sawing apparatus, the combination with a main frame, of a saw-frame pivotally mounted thereon, a saw arranged to reciprocate in the saw-frame, a motor on the main frame, a crank-shaft driven by the motor-shaft, a lever pivoted intermediate its ends and longitudinally slotted on each side of the fulcrum, the crank on the crank-shaft engaging the upper slot and a pin on one end of the saw engaging the lower slot to reciprocate the IOO saw, and means for clamping the main frame to the timber to be sawed, substantially as described.

2. A portable sawing apparatus, comprising a main framing, a saw-frame carried by same, a saw reciprocating in said frame, an electric motor mounted on the main framing, a crankshaft driven by the motor shaft, a double slotted lever pivoted to the main framing and having one arm engaged by the crank-pin and the other by a pin on the saw, toothed jaws rigidly secured to the main framing, slides traveling on the latter, toothed jaws pivoted thereto and cooperating with the Jfirst said jaws, means for fixing the slides in any desired position and means for forcing the pivoted jaws against the timber, substantially as set forth.

3. A portable sawing apparatus comprising a main frame, a saw-frame carried thereby, a

saw reciprocating in said frame, an electric motor mounted on the main frame, a crankshaft driven by the motor-shaft, a double slotted lever pivoted to the main frame and having one arm engaged by a crank-pin and the other by a pin on the saw, toothed jaws rigidly secured to the main frame, Slides traveling on the latter, toothed jaws pivoted Vto the slides and cooperating with the rst-named jaws, pawls and racks for fixing'the slides in any desired position, and toggle-levers for forcing the pivoted jaws against the timber, substantially as described.

1n testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

v FELIX RICHTER. Witnesses:

ALBIN RICHTER, RUDOLPH FRICKE. 

